A method of calculated determination of the accelerated test conditions of compressor blades operating in a corrosive medium

Steel 08Khl 7N6T in recent years has become widely used for manufacturing parts for pumps and gas turbines in connection with its better mechanical properties and corrosion resistance, compared with the chromium steel 20Kh13 used previously for this purpose. In this paper, we present the results of an investigation of the longterm and fatigue strength and the corrosion resistance of steel 08Khl7N6T, and also data on the effectiveness of using it to manufacture compressors.The austenitic-martensitic corrosion-resistant steel 08Khl7N6T (Table 1) is supplied in the form of billets of circular and square cross section, and also in the form of sheets of metal formed by open smelting and after electroslag remelting. The steel is subjected to heat treatment according to the following procedure: quenching in air from 950-970°C (3 h); double tempering at 740-760°C with cooling in air, then in water down to room temperature; tempering at 510-530°C.The guaranteed level of the mechanical properties of billets of cross section up to 300 mm for this steel are: Cro. 2 >-735 N/mm 2, a B >_ 880 N/mm 2, 6 >__ 12%, • ~ 40%, a 1 _ 49 J/cm 2. We should note the low anisotropy in the properties of the forged rods. The critical brittle temperature defined by an impact toughness a 1 _> 30 J/cm 2 is below 100°C, while the critical brittle temperature* TED S defined by the presence of 70% fiber in the break (for static bend loading) is below -60°C; for steel 20Kh13, TCD S = 20°C; for steel 14Kh17N2, TCD s = -10°C. The linear expansion coefficient of steel 08K17N6T (c~20_40o = 12.4-10 -6 K -1) is somewhat higher than for steels 20Kh13 and 14Kh17N2 [a2o_4o 0 = (11-11.4)-10 -6 K-l].

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A method of calculated determination of the accelerated test conditions of compressor blades operating in a corrosive medium

Cited by 2 publications

References 4 publications

Evaluating the life and ensuring reliability of large blades of an axial compressor. Report 2

Evaluating the life and ensuring reliability of large blades of an axial compressor. Report 2

Steel 08Kh17N6T for compressor blades

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